Pondless Waterfall Vault. is the ideal pump vault for use in Pondless® Waterfalls, rainwater harvesting systems, and more. The Pondless Waterfall Vault is designed to integrate with Aquascape AquaBlox®, effectively protecting pumps while making installation quick, precise, and simple. Its durable, rotationally molded, rounded polyethylene shape maximizes structural strength, while its large interior fits a wide range of pump sizes up to 12,500 gallons per hour. The Aquascape Pondless Waterfall Vault.